{"product_id":"dual-channel-voltage-to-current-v-i-converter-circuit-with-bjt","title":"Dual Channel Voltage-to-Current (V-I) converter circuit with BJT","description":"\u003cp\u003eThis low-side voltage-to-current (V-I) converter delivers a well-regulated current to a load. The circuit accepts an input voltage from\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e0V to 3V\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eand converts it to a current from\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e0A to 6A\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e(combined). The current is accurately regulated by feeding back the voltage drop across a low-side current-sense resistor (R8, R9 + R16, R17) to the OPAMP. Resistor divider (R4 and R5 + R12 and R13) is implemented to limit the maximum voltage at the non-inverting input, Vin, and sense resistor, (R8, R9 + R16, R17), at full-scale. Using a\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eDarlington BJT\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ereduces the output current requirement for the OPAMP. Feedback components R6+R13, R7+R15, and C5+C6 provide compensation to ensure stability. R6+R13 isolates the input capacitance of the bipolar junction transistor (BJT) R7+R15 provides a DC feedback path directly at the current setting resistor (R8, R9 + R16, R17), and C5+C6 provides a high-frequency feedback path that bypass the BJT.\u003c\/p\u003e\n\u003cp\u003eThe project is built using the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eOPA2170\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003edual OPAMP, which enables the creation of two separate channels. Each channel is capable of handling a current of up to\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e3A\u003c\/strong\u003e, and when combined, they provide a total current of\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e6A\u003c\/strong\u003e. Users have the flexibility to utilize only one channel if a lower current is required, in which case the components associated with the second channel can be omitted. To achieve a\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e6A load\u003c\/strong\u003e, simply tie inputs A1 and A2 together. For a 3A load, only one input is necessary.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eInput Power Supply Range 12V to 30V DC\u003c\/li\u003e\n\u003cli\u003eLoad 5Amps (3A + 3A)\u003c\/li\u003e\n\u003cli\u003eInput Voltage 0 to 3V\u003c\/li\u003e\n\u003cli\u003e4 x 4 mm Mounting Holes\u003c\/li\u003e\n\u003cli\u003eOn Board Power LED\u003c\/li\u003e\n\u003cli\u003ePCB Dimensions 91.44 x 36.20 mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eConnections\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCN1: Pin 1 = Power Supply Input 12V TO 30V, Pin 2 = GND\u003c\/li\u003e\n\u003cli\u003eCN2: Pin 1 = +Load, Pin 2 = -Load\u003c\/li\u003e\n\u003cli\u003eCN3: Pin 1 = No Use, Pin 2 = Analog Voltage in for Channel A1, Pin 3 = GND\u003c\/li\u003e\n\u003cli\u003eCN4: Pin 1 = No Use, Pin 2 = Analog Voltage in for Channel A2, Pin 3 = GND\u003c\/li\u003e\n\u003cli\u003eD1: Power LED\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"dotfry","offers":[{"title":"Default Title","offer_id":47241703784620,"sku":"B136","price":78.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/6436\/7532\/files\/B136.jpg?v=1789717645","url":"https:\/\/dotfry.com\/products\/dual-channel-voltage-to-current-v-i-converter-circuit-with-bjt","provider":"dotfry","version":"1.0","type":"link"}